The song "That'll Be The Day" was actually written by Buddy Holly and Jerry Allison, and it was originally recorded by Buddy Holly and the Crickets in 1957. Waylon Jennings later covered the song and released his version in 1972. The lyrics of the song depict a situation where the narrator's partner threatens to leave, but the narrator doesn't believe it. They believe that the partner's words and actions are insincere, and they see through the lies. The phrase "That'll be the day" is used sarcastically to express disbelief and doubt in the partner's intentions. The song expresses the narrator's confidence that their relationship will continue, despite the partner's threats. They question the partner's love and loyalty, implying that the partner only loves them until they decide to leave. The "Cupid" reference in the lyrics suggests that the partner was once in love with the narrator, but now their feelings have changed. Overall, the song conveys a sense of skepticism and defiance towards the partner's words. It's a declaration that the narrator will not be easily fooled or hurt by false promises.
